Fernando Alonso admitted he needs a generous slice of good luck and for Sebastian Vettel to run into trouble if he is to have any chance of stopping the German winning a fourth consecutive world title.
The 32-year-old Spaniard finished second behind the 26-year-old German in Sunday's Italian Grand Prix, but trails him by 53 points with seven races remaining in the drivers' championship.
Red Bull's Vettel drove to his sixth win of the season but Alonso has not won a race in his Ferrari since the Spanish Grand Prix in early May.
Alonso said: "I think for the championship, we need to be realistic now.
"It's still a very big gap and we don't have enough races and probably don't have the speed right now to win some consecutive races.
"We need to be lucky and we need to have some DNFs (Did Not Finish) from Seb, or something, to win the championship.
"With the races left, and the points disadvantage, it is hard."
He insisted, however, that he was not abandoning hope.
"Last year, it was the same. It was difficult for him to catch up and it was up to us -- we didn't complete the job.
"Instead, we had one DNF in Suzuka and other problems.
"So, there is still a long way to go. We will try until the last race to be as good as we can and score as many points as possible.
"And then in Brazil we will see how many points we have compared to this."